NASA turns to deep sea training for space
CNN

On a rocking boat in the Atlantic Ocean, astronaut Dave Williams struggled into his wetsuit. After helping build the International Space Station in 1998, a dive into the sea was the unlikely beginning of his journey back into space.
Williams, 50, a crew member of the Space Shuttle Columbia, was preparing to visit an underwater habitat called Aquarius, located under the sea off the Florida Keys.
NASA is using the marine laboratory to train humans and test technology for expeditions into space, the moon and Mars.